The Telychian (early Silurian) oxygenation event in northern Europe:A geochemical and magnetic perspective

Hounslow, M.W. and Ratcliffe, K.T. and Harris, S.E. and Nawrocki, J. and Wójcik, K. and Montgomery, P. and Woodcock, N.H. (2021) The Telychian (early Silurian) oxygenation event in northern Europe:A geochemical and magnetic perspective. Palaeogeography, Palaeoclimatology, Palaeoecology, 567. ISSN 0031-0182

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Abstract

Widespread marine red beds in the European Telychian (lower-Silurian) are one expression of an interval of unusually widespread oxic conditions in low palaeolatitude Silurian seas. This work examines in detail the geochemical and magnetic susceptibility record of cores from southern Poland, which also express the Telychian oxygenation event in grey-mudstones. The geochemical data provide an evaluation of redox conditions, palaeoweathering, sediment provenance, primary palaeoproductivity and upwelling. Sediment provenance is evaluated against possible sources on the East European Craton. The data suggest that the magnetic susceptibility is carried by both paramagnetic Fe-silicates and Fe-oxides. Magnetic data are supplemented by magnetic hysteresis and isothermal remanent magnetisations, and mineralogical data on selected samples. In Poland the oxygenation event is clearly expressed in larger Fe2O3 and magnetic susceptibility, caused by enhanced palaeoweathering, changes in sediment provenance and a redox influence on the preservation of Fe-oxides. A much briefer oxygenation event is detected in the upper Rhuddanian. Palaeoproductivity fluxes indicate that the Telychian oxygenation event was caused by a reduction in primary oceanic palaeoproductivity, possibly linked to a reduction in nutrient delivery to the margin of the East European Craton, inferred to be caused by increased aridity. The increased aridity stimulated enhanced delivery of Fe-enriched aeolian dust from soils, generating a magnetic susceptibility and Fe2O3 expression of the Telychian oxygenation event.

Item Type:
Journal Article
Journal or Publication Title:
Palaeogeography, Palaeoclimatology, Palaeoecology
Additional Information:
This is the author’s version of a work that was accepted for publication in Palaeogeography, Palaeoclimatology, Palaeoecology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Palaeogeography, Palaeoclimatology, Palaeoecology, 567, 2021 DOI: 10.1016/j.palaeo.2021.110277
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1910
Subjects:
ID Code:
155959
Deposited By:
Deposited On:
10 Jun 2021 10:40
Refereed?:
Yes
Published?:
Published
Last Modified:
10 Jun 2021 10:40